/*
 * Copyright 2004 - 2013 Wayne Grant
 *           2013 - 2024 Kai Kramer
 *
 * This file is part of KeyStore Explorer.
 *
 * KeyStore Explorer is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * KeyStore Explorer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with KeyStore Explorer.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.kse.crypto.x509;

import java.util.Iterator;
import java.util.List;
import java.util.Vector;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x509.AccessDescription;

/**
 * X509 extension SubjectInfoAccess, RFC5280:
 * <p>
 * SubjectInfoAccessSyntax ::= SEQUENCE SIZE (1..MAX) OF AccessDescription
 * <p>
 * AccessDescription ::= SEQUENCE {
 * accessMethod OBJECT IDENTIFIER,
 * accessLocation GeneralName }
 */
public class SubjectInfoAccess extends ASN1Object {

    private List<AccessDescription> accessDescriptions;

    /**
     * Creates a new instance with the given list of accessDescription.
     */
    public SubjectInfoAccess(List<AccessDescription> accessDescriptions) {
        this.accessDescriptions = accessDescriptions;
    }

    public static SubjectInfoAccess getInstance(Object obj) {
        if (obj instanceof SubjectInfoAccess) {
            return (SubjectInfoAccess) obj;
        } else if (obj instanceof ASN1Sequence) {
            return new SubjectInfoAccess((ASN1Sequence) obj);
        } else if (obj instanceof byte[]) {
            return new SubjectInfoAccess(ASN1Sequence.getInstance(obj));
        }

        throw new IllegalArgumentException("unknown object");
    }

    private SubjectInfoAccess(ASN1Sequence seq) {
        accessDescriptions = new Vector<>();

        for (int i = 0; i != seq.size(); i++) {
            accessDescriptions.add(AccessDescription.getInstance(seq.getObjectAt(i)));
        }
    }

    /**
     * Returns a list with the AccessDescription objects.
     */
    public List<AccessDescription> getAccessDescriptionList() {
        return accessDescriptions;
    }

    @Override
    public ASN1Primitive toASN1Primitive() {
        ASN1EncodableVector vec = new ASN1EncodableVector();
        for (AccessDescription accessDescription : accessDescriptions) {
            vec.add(accessDescription.toASN1Primitive());
        }

        return new DERSequence(vec);
    }
}
